Piper SEMINOLE PA-44-180, Maintenance Manual

Page: 749 / 881

3. No lubrication is required on the starting motor except at the time of overhaul. Then lubricate the entire
shaft under Bendix Drive, fill grooves in armature shaft at drive end and pack gear box with 1.3 to 2.0
ounces of Lithium Soap Base Grease 1925 Molytex “O” or equivalent.
4. The starting motor should be operated for a few seconds with the ignition switch off to make sure that the
pinion engages properly and that it turns freely without binding or excessive noise. Then the engine should
be started two or three times to see that the pinion disengages properly when the engine is turned off.
OVERHAUL OF STARTING MOTOR.
If during the above inspection any indication of starting motor difficulty is noted, the starting motor should be
removed from the engine for cleaning and repair.
REMOVAL OF STARTING MOTOR.
To remove the starting motor from the engine, first disconnect the ground cable from the battery post to
prevent short circuiting. Disconnect the lead from the starting motor terminal, then take out the mounting bolts.
The motor can then be lifted off and taken to the bench for overhaul.
DISASSEMBLY OF STARTING MOTOR.
1. Remove the frame screws from the commutator end head and pull end head and armature from frame. Lift
brushes and lock in elevated position with brush springs. Use a puller to remove the end head from the
armature. Use a special bearing puller to remove the sealed ball bearing from the armature shaft.
2. Remove the frame screws that secure the gear housing to the frame. Remove bolts and nuts holding the gear
housing to the pinion housing and separate the two units. Pull the Bendix shaft from the pinion housing. Do
not lose the steel spacer that is located on the pinion end of the shaft. Remove the reduction gear, woodruff
key and spacer from shaft.
3. Turn the Bendix pinion until it locks in the extended position. Locate “spiral” pin and use a punch to
remove. Slide drive assembly off the shaft. Do not attempt to disassemble the drive and do not dip it in
cleaning solvent.
4. To remove the roller bearings from the gear housing, use an arbor press and the correct bearing arbor. DO
NOT HAMMER OUT. Each part should be cleaned and inspected for excessive wear or damage. Bearings
should be checked for proper clearance and evidence of roughness or galling. Oil and dirt should be
removed from insulation and the condition of the insulation checked.
BRUSHES.
Check the brushes to see that they slide freely in their holders and make full contact on the commutator. If
worn to half their original length or less, they should be replaced.
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
8 0 - 1 0 - 0 5
Page 80-05
Revised: May 15, 1989
3I17
PIPER AIRCRAFT